What happens if the smoke dissipates within 3 seconds during the snap throttle events?

The correct answer reflects that if the smoke dissipates within 3 seconds during the snap throttle event, it indicates that the vehicle is likely not emitting excessive pollutants or harmful emissions. In a smog check, the snap throttle test is designed to gauge the vehicle's emissions response to sudden acceleration. When the emissions clear rapidly, it typically suggests that the combustion process is functioning adequately and that there are no significant oil or fuel issues that would contribute to a failure.

Passing the inspection under these conditions means that the vehicle meets the necessary standards for emissions control, suggesting that the engine and emissions systems are operating effectively. Thus, the immediate dissipation of smoke is a positive indicator confirming that the vehicle can pass the inspection without further interventions or concerns. This outcome highlights the importance of performance during the test, as it directly correlates with the vehicle’s ability to meet environmental standards.